Swing seat



FIG. 1 is a perspective view of a swing seat;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof, the left side view being a mirror image thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a back view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines shown in the drawing form no part of the claimed design. 

The ornamental design for a swing seat, as shown and described. 